*{
    margin: 0;
    padding: 0;
}
ul,li{
    list-style: none;
}
.container::before{
    content: none;
}
.container::after{
    content: none;
}

.padding-t-60{
    padding-top: 60px;
}

header{
    position: fixed;
    z-index: 999;
    width: 100%;
    height: 60px;
    line-height: 60px;
    background: black;
    color: white;
    font-size: 16px;
}
header ul,li{
    margin: 0;
}
header .logo img{
    width: 140px;
    height: 50px;
}
.head{
    display: flex;
    justify-content: space-between;
    align-items: center;
}
header ul{
    height: 100%;
    display: flex;
}
header ul li a{
    padding: 0 10px;
    color: white;
}
header ul li a:visited,header ul li a:link{
    color: white;
    text-decoration: none;
}
header ul li a:hover{
    color: chartreuse;
    text-decoration: none;
}
header .header_icon .qq,.weixin{
    overflow: hidden;
    position: relative;
}
header .header_icon .qq:hover,.weixin:hover{
    overflow: visible;
}
header .header_icon .code{
    padding: 20px;
    background: white;
    position: absolute;
    transform: translateX(-40%);
}
header .header_icon .code img{
    width: 100px;
    height: 100px;
}
@media screen and (max-width:750px) {
    header{
        font-size: 12px;
    }
    header .logo img{
        width: 100px;
        height: 40px;
    }
}
@media screen and (max-width:680px) {
    header .logo{
        display: none;
    }
}
